HELP!?!

These tests are over the last 4 days. I can clearly see a positive line, although light. All of these positive lines appeared within the 5 minute time frame although it did take almost the full 5 mins it wasn’t immediate. My period is to arrive on Sunday. I took two clear blue tests and both clearly said “not pregnant”. Am I crazy for seeing these lines? Has anyone else had this happen? I’m going a little crazy here!!!